Bosch Dishwasher E15 Error? Water in the Base and What to Check

Reviewed by PRO MAX HVAC & Appliance Repair technicians, EPA 608 certified

An E15 code on a Bosch dishwasher means water reached the base pan under the tub and lifted the small float that triggers the leak protection. The dishwasher stops the cycle, shuts off the water and keeps draining to protect your floor. The usual causes are suds from the wrong detergent, a loose spray arm or a worn door seal. Find the cause first, because the code comes back until the base is dry.

The design explains why a small leak trips it so fast. Under its current specification, ENERGY STAR certified standard-size dishwashers use no more than 3.2 gallons of water per cycle, so a Bosch works with a shallow pool in the sump and sprays it hard. A cup or two of water escaping the tub is enough to lift the float, and that is exactly what the system is designed to catch before it reaches your cabinets.

What E15 Means on a Bosch Dishwasher

E15 is a leak warning, not a failed part. Bosch puts a plastic base pan under the tub with a foam float and a switch. When water collects in the pan, the float rises, the control stops the cycle and the drain runs to empty the tub. On many models the display shows a faucet icon along with the code.

That is also why the drain keeps running. It is not stuck. The dishwasher keeps emptying the tub until the float drops, and it cannot drop while the pan still holds water.

Start With Detergent and Suds

Oversudsing is the most common cause, and the easiest to fix. Hand dish soap, a squirt of it to pre-rinse a pan, or a double dose of gel detergent makes foam that pushes past the door seal and spills into the base. Rinse aid poured into the detergent cup does the same.

Look inside the tub. If you see suds, wipe them out with towels and sponge up the water in the sump, then run a short rinse cycle with no detergent once the E15 clears. Use only dishwasher detergent from then on, and measure it. Tablets are the simplest way to get the dose right.

Check the Spray Arms, Filter and Door Seal

A loose spray arm sprays water sideways at the door edge, where it leaks out under the seal. Turn the dishwasher off, then check that the lower spray arm is pressed fully onto its hub and spins freely, and that the middle arm is clipped in place under the upper rack. A pan handle or a utensil hanging through the rack can knock an arm off its mount mid-cycle.

Twist out the filter at the bottom of the tub and rinse it. A clogged filter backs water up around the sump and splashes it toward the door. Then run your finger along the door seal. A seal that is torn, flattened or pulled out of its channel lets water run down the front of the tub and into the base.

Here is a typical E15 call in a Roseville kitchen. The dishwasher is a seven-year-old Bosch that has worked fine. After a weekend of hosting, someone ran it with dish soap because the tablets were gone. The base filled with foam, the float lifted, and the drain ran all night. Nothing was broken. The fix was a rinse, a dry base pan and a new box of tablets.

Getting the Base Pan Dry

Turning the dishwasher off and on clears the display, but E15 returns while water still sits in the base. With the power off at the breaker, the pan has to dry or be drained. On a built-in dishwasher that means unhooking it from the cabinet and pulling it out, which also means disconnecting the water and drain lines. Our recommendation: unless you have done that before, leave it to a technician. A dishwasher pulled out carelessly can kink its drain hose or crack its inlet fitting, and then you have a real leak.

If the cause was suds, the base often dries on its own within a day or two with the dishwasher left off. If E15 comes back on the first cycle after that, the water is coming from a leak inside.

Leaks That Need a Technician

When the detergent, spray arms, filter and door seal all check out, E15 points to an internal leak. The usual sources are the circulation pump seal, the drain hose connection at the sump, a cracked sump, or the water inlet valve and its AquaStop hose. Each needs the dishwasher pulled out and the base opened. Check the CPSC recall database with your model number too, since some dishwasher models have had leak-related recalls.

When to Call a Pro

Call when E15 returns after you have fixed suds, reseated the spray arms and cleaned the filter, when you see water under the front kickplate, or when the drain keeps running for more than a day. Have the model and serial number from the label on the door edge ready.

PRO MAX HVAC & Appliance Repair handles Bosch dishwasher repair across the Sacramento area, including Roseville and Rocklin. Call (916) 234-5925 or book through our online booking page.

Sources

• ENERGY STAR — Dishwashers
• U.S. Consumer Product Safety Commission — Recalls